Prince Turbo Shark default grip

I ordered the Prince Turbo Shark MP of the 4 3/8 inch size about a month ago. I discovered that the default grip that comes on the Turbo Shark is Prince DuraTac overgrip. Does this mean that if I were to remove the original DuraTac grip, then I'd be left with a racquet handle only half a size smaller instead of a full size? So then could I replace the DuraTac with a Wilson Pro overgrip and have my original 4 3/8 grip size?